EP3165544B1 - Acrylkautschuk, acrylkautschukzusammensetzung, vernetztes acrylkautschukprodukt und verwendung von vernetztem akrylkautschukprodukt für dichtungselement - Google Patents

Acrylkautschuk, acrylkautschukzusammensetzung, vernetztes acrylkautschukprodukt und verwendung von vernetztem akrylkautschukprodukt für dichtungselement Download PDF

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Publication number
EP3165544B1
EP3165544B1 EP15814869.2A EP15814869A EP3165544B1 EP 3165544 B1 EP3165544 B1 EP 3165544B1 EP 15814869 A EP15814869 A EP 15814869A EP 3165544 B1 EP3165544 B1 EP 3165544B1
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acrylic rubber
gasket
weight
units
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French (fr)
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EP3165544A4 (de
EP3165544A1 (de
Inventor
Nobuyoshi Emori
Tomonori Ogawa
Takanori Arakawa
Takayuki Kogure
Kazutaka Yokoyama
Ryosuke KODAIRA
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Zeon Corp
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Zeon Corp
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F20/00—Homopolymers and copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride, ester, amide, imide or nitrile thereof
    • C08F20/02—Monocarboxylic acids having less than ten carbon atoms, Derivatives thereof
    • C08F20/04—Acids, Metal salts or ammonium salts thereof
    • C08F20/06—Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
    • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
    • C08F220/10—Esters
    • C08F220/12—Esters of monohydric alcohols or phenols
    • C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
    • C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
    • C08F220/1804—C4-(meth)acrylate, e.g. butyl (meth)acrylate, isobutyl (meth)acrylate or tert-butyl (meth)acrylate
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F120/00—Homopolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride, ester, amide, imide or nitrile thereof
    • C08F120/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
    • C08F120/10—Esters
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/0008—Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
    • C08K5/0025—Crosslinking or vulcanising agents; including accelerators
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/16—Nitrogen-containing compounds
    • C08K5/17—Amines; Quaternary ammonium compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/16—Nitrogen-containing compounds
    • C08K5/205—Compounds containing groups, e.g. carbamates
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/16—Nitrogen-containing compounds
    • C08K5/34—Heterocyclic compounds having nitrogen in the ring
    • C08K5/3467—Heterocyclic compounds having nitrogen in the ring having more than two nitrogen atoms in the ring
    • C08K5/3477—Six-membered rings
    • C08K5/3492—Triazines
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K5/00—Use of organic ingredients
    • C08K5/36—Sulfur-, selenium-, or tellurium-containing compounds
    • C08K5/37—Thiols
    • C08K5/378—Thiols containing heterocyclic rings
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
    • C08L33/04—Homopolymers or copolymers of esters
    • C08L33/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical
    • C08L33/08—Homopolymers or copolymers of acrylic acid esters
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K3/00—Materials not provided for elsewhere
    • C09K3/10—Materials in mouldable or extrudable form for sealing or packing joints or covers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K3/00—Materials not provided for elsewhere
    • C09K3/12—Materials for stopping leaks, e.g. in radiators, in tanks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/02—Sealings between relatively-stationary surfaces
    • F16J15/021—Sealings between relatively-stationary surfaces with elastic packing
    • F16J15/022—Sealings between relatively-stationary surfaces with elastic packing characterised by structure or material
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J15/00—Sealings
    • F16J15/16—Sealings between relatively-moving surfaces
    • F16J15/32—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings
    • F16J15/3284—Sealings between relatively-moving surfaces with elastic sealings, e.g. O-rings characterised by their structure; Selection of materials
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
    • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
    • C08F220/10—Esters
    • C08F220/12—Esters of monohydric alcohols or phenols
    • C08F220/16—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms
    • C08F220/18—Esters of monohydric alcohols or phenols of phenols or of alcohols containing two or more carbon atoms with acrylic or methacrylic acids
    • C08F220/1802—C2-(meth)acrylate, e.g. ethyl (meth)acrylate
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K3/00—Materials not provided for elsewhere
    • C09K3/10—Materials in mouldable or extrudable form for sealing or packing joints or covers
    • C09K2003/1034—Materials or components characterised by specific properties
    • C09K2003/1068—Crosslinkable materials
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K3/00—Materials not provided for elsewhere
    • C09K3/10—Materials in mouldable or extrudable form for sealing or packing joints or covers
    • C09K2003/1087—Materials or components characterised by specific uses
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K2200/00—Chemical nature of materials in mouldable or extrudable form for sealing or packing joints or covers
    • C09K2200/06—Macromolecular organic compounds, e.g. prepolymers
    • C09K2200/0607—Rubber or rubber derivatives
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K2200/00—Chemical nature of materials in mouldable or extrudable form for sealing or packing joints or covers
    • C09K2200/06—Macromolecular organic compounds, e.g. prepolymers
    • C09K2200/0615—Macromolecular organic compounds, e.g. prepolymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C09K2200/0625—Polyacrylic esters or derivatives thereof

Definitions

  • the present invention relates to an acrylic rubber having excellent hydrolysis resistance and an excellent balance between oil resistance and cold resistance, an acrylic rubber composition using this acrylic rubber, and a cross-linked acrylic rubber product using this acrylic rubber composition. Further, the present invention relates to the use of the cross-linked acrylic rubber product for a seal member having excellent hydrolysis resistance and an excellent balance between oil resistance and cold resistance.
  • An acrylic rubber obtained by polymerizing an acrylic acid alkyl ester or polymerizing an acrylic acid alkyl ester and an acrylic acid alkoxyalkyl ester is known as a rubber having cold resistance according to an environment for use and having excellent oil resistance particularly at a high temperature. Therefore, demand for the acrylic rubber is increasing as a hose for automobiles, an oil seal for automobiles, an O-ring for automobiles, a conveyor belt incorporated in a device or a machine, or the like.
  • Patent Literature 1 discloses an acrylic rubber obtained by copolymerizing an acrylic acid alkyl ester, a specific ratio of a methacrylic acid alkyl ester, and a specific ratio of a cross-linkable monomer. More in detail, Patent Literature 1 discloses an acrylic rubber obtainable by copolymerizing 100 parts by mass of an alkyl acrylate with from 10 to 100 parts by mass of an alkyl methacrylate and from 0.5 to 4 parts by mass of a crosslinkable monomer.
  • Patent Literature 2 discloses an acrylic rubber including a methacrylic acid alkyl ester unit, an acrylic acid alkyl ester unit and/or an acrylic acid alkoxy ester unit, and a carboxy group-containing ⁇ , ⁇ -ethylenically unsaturated monomer unit in specific ratios.
  • Patent Literature 2 discloses an acrylic rubber comprising 2 ⁇ 8% by weight of a methacrylic acid alkyl ester unit (A), 87 ⁇ 97.5% by weight of an acrylic acid alkyl ester unit (B) and / or an alkoxyalkyl acrylate ester unit (C) and 0.5 ⁇ 5% by weight of a carboxy group-containing ⁇ , ⁇ -ethylenically unsaturated monomer unit (D) .
  • Patent Literature 3 discloses an acrylic elastomer composition comprising an acrylic elastomer (A), and a polyorganosiloxane-containing graft polymer (B).
  • Patent Literature 4 discloses an acrylic block copolymer (A) comprising a methacrylic polymer block (a) and an acrylic polymer block (b), at least one of the polymer blocks containing, in its main chain, at least one acid anhydride group (c) represented by formula (1): (wherein R 1 s each represent hydrogen or a methyl group and may be the same or different, in represents an integer of 0 to 3, and m represents an integer of 0 or 1).
  • Patent Literature 5 discloses an elastomer composition comprising following two components (a) and (b) as essential components;
  • Patent Literature 6 discloses a thermoplastic elastomer composition
  • a thermoplastic elastomer composition comprising a (meth) acrylic block copolymer (A), a compound (B) containing two or more amino groups in one molecule, and a thermoplastic resin (C), wherein the (meth) acrylic block copolymer (A) is consisting of a (meth)acrylic polymer block (A1) and an acrylic polymer block (A2), having at least one acid anhydride group represented by general formula (1) (a1) (In the formula, R 1 s are hydrogen atoms or methyl groups, may be identical to one another or different from one another.
  • n is an integer of from 0 to 3
  • m is an integer of 0 or 1) in a main chain of at least one of the polymer blocks, and the (meth)acrylic block copolymer (A) and the compound (B) are dynamic cross-linked in the thermoplastic resin (C).
  • Patent Literature 7 discloses a thermoplastic resin composition comprising an acrylic block copolymer(A), a polyorganosiloxane graft polymer (B), and a resin (C) containing an epoxy group.
  • Patent Literature 8 discloses a method for producing an acrylic block copolymer (A), the method comprising (1) a step of polymerizing an acrylic polymer block (a) from acrylic monomer components using a solvent (X) as a polymerization solvent; (2) a step of polymerizing a methacrylic polymer block (b) by adding methacrylic monomer components and solvent (Y) to a polymer solution obtained by the step (1); (3) a step of purifying a polymer solution of an acrylic block copolymer (A) consisting of the acrylic polymer block (a) and the methacrylic polymer block (b) obtained by the step (2); (4)a step of evaporating and separating polymerization solvents, unreacted acrylic monomer and methacrylic monomer from an acrylic block copolymer solution obtained by the step (3); (5) a step of distilling a recovered solvent obtained by the step (4), wherein the recovered solvent is separated into a solvent (Z) having weight ratio of (X)/(Y) being 0.5 or more
  • the rubber parts are seal members for automobiles in contact with an engine oil or the like (O-ring, gasket, or the like), the rubber parts are further deteriorated and hardened due to hydrolysis caused by contact with water and a metal salt such as zinc derived from various additives contained in the engine oil, and influence of heat or the like. Therefore, the rubber parts require to have hydrolysis resistance in addition to the oil resistance and cold resistance.
  • a first object of the present invention is to provide an acrylic rubber capable of obtaining a cross-linked acrylic rubber product having an excellent balance between oil resistance and cold resistance and further having excellent hydrolysis resistance, an acrylic rubber composition using this acrylic rubber, and a cross-linked acrylic rubber product using this acrylic rubber composition.
  • a second object of the present invention is to provide a seal member having an excellent balance between oil resistance and cold resistance and further having excellent hydrolysis resistance.
  • the present inventors made intensive studies. As a result, the present inventors have found that the first object can be achieved by an acrylic rubber including a specific methacrylic acid alkyl ester unit, a specific acrylic acid alkyl ester unit, a specific acrylic acid alkoxy ester unit, and a cross-linking site monomer in specific ratios, and an acrylic rubber composition containing this acrylic rubber and a cross-linking agent, and have completed the present invention.
  • the present inventors made intensive studies. As a result, the present inventors have found that the second object can be achieved by cross-linking the acrylic rubber composition containing an acrylic rubber including a specific methacrylic acid alkyl ester unit, a specific acrylic acid alkyl ester unit, a specific acrylic acid alkoxy ester unit, and a cross-linking site monomer in specific ratios, and a cross-linking agent, and have completed the present invention.
  • the present invention provides:
  • An acrylic rubber of the present invention can provide a cross-linked acrylic rubber product having an excellent balance between oil resistance and cold resistance and further having excellent hydrolysis resistance. Further, the present invention can provide an acrylic rubber composition using the acrylic rubber and a cross-linked acrylic rubber product using the acrylic rubber composition.
  • a seal member which can be obtained using the cross-linked acrylic rubber composition of the present invention has an excellent balance between oil resistance and cold resistance and further has excellent hydrolysis resistance.
  • An acrylic rubber of the present invention contains (a) methyl methacrylate units, (b) ethyl acrylate units, (c) n-butyl acrylate units, (d) 2-methoxyethyl acrylate units, and (e) cross-linking site monomer units.
  • the acrylic rubber contains 10 to 20% by weight of (a) the methyl methacrylate units, 15% by weight or less of (b) the ethyl acrylate units, 60 to 80% by weight of (c) the n-butyl acrylate units, 10 to 30% by weight of (d) the 2-methoxyethyl acrylate units, and 0.5 to 5% by weight of (e) the cross-linking site monomer units.
  • a seal member of the present invention is formed of a cross-linked acrylic rubber product obtained by cross-linking an acrylic rubber composition containing an acrylic rubber containing (a) methyl methacrylate units, (b) ethyl acrylate units, (c) n-butyl acrylate units, (d) 2-methoxyethyl acrylate units, and (e) cross-linking site monomer units, in which the acrylic rubber contains 10 to 18% by weight of (a) the methyl methacrylate units, 5% by weight or less of (b) the ethyl acrylate units, 60 to 65% by weight of (c) the n-butyl acrylate units, 11 to 24% by weight of (d) the 2-methoxyethyl acrylate units, and 1 to 3% by weight of (e) the cross-linking site monomer units, and a cross-linking agent.
  • the seal member is used in an environment in contact with an oil for an engine containing 500 to 2000 ppm of water and
  • an oil for an engine means a concept including all oils generally used in an engine, such as a so-called engine oil which is a lubricating oil, a fuel oil such as gasoline, or a mixture thereof.
  • Zinc included in an oil for an engine means a concept including a zinc ion and a metal salt of zinc.
  • the acrylic rubber of the present invention contains (a) methyl methacrylate units, (b) ethyl acrylate units, (c) n-butyl acrylate units, (d) 2-methoxyethyl acrylate units, and (e) cross-linking site monomer units.
  • the acrylic rubber contains 10 to 20% by weight, preferably 10 to 18% by weight of (a) the methyl methacrylate units, 15% by weight or less, preferably 5% by weight or less of (b) the ethyl acrylate units, 60 to 80% by weight, preferably 60 to 74% by weight, more preferably 60 to 65% by weight of (c) the n-butyl acrylate units, 10 to 30% by weight, preferably 11 to 24% by weight of (d) the 2-methoxyethyl acrylate units, and 0.5 to 5% by weight, preferably 1 to 3% by weight of (e) the cross-linking site monomer units.
  • an acrylic rubber containing (a) methyl methacrylate units, (b) ethyl acrylate units, (c) n-butyl acrylate units, (d) 2-methoxyethyl acrylate units, and (e) cross-linking site monomer units, in which the acrylic rubber contains 10 to 18% by weight of (a) the methyl methacrylate units, 5% by weight or less of (b) the ethyl acrylate units, 60 to 65% by weight of (c) the n-butyl acrylate units, 11 to 24% by weight of (d) the 2-methoxyethyl acrylate units, and 1 to 3% by weight of (e) the cross-linking site monomer units is preferably used.
  • the seal member When a seal member formed of a cross-linked acrylic rubber product obtained by cross-linking the acrylic rubber having a composition in the above range is used in an environment in contact with an oil for an engine containing 500 to 2000 ppm of water and 1000 to 5000 ppm of zinc, the seal member has a specifically excellent balance between oil resistance and cold resistance, and further has excellent hydrolysis resistance.
  • the seal member of the present invention has an excellent balance between oil resistance and cold resistance, and further has excellent hydrolysis resistance.
  • the seal member of the present invention has a specifically excellent balance between oil resistance and cold resistance, and further has excellent hydrolysis resistance.
  • a methyl methacrylate unit is used as the specific methacrylic acid alkyl ester unit
  • an ethyl acrylate unit and an n-butyl acrylate unit are used as the specific acrylic acid alkyl ester unit
  • a 2-methoxyethyl acrylate unit is used as the specific acrylic acid alkoxy ester unit.
  • the acrylic rubber of the present invention is usually obtained by copolymerizing a monomer composition consisting of (A) a methyl methacrylate, (B) an ethyl acrylate, (C) an n-butyl acrylate, (D) a 2-methoxyethyl acrylate, and (E) a cross-linking site monomer.
  • cross-linking site monomer a monomer copolymerizable with (A) the methyl methacrylate, (B) the ethyl acrylate, (C) the n-butyl acrylate, and (D) the 2-methoxyethyl acrylate and capable of introducing a cross-linking site used in forming a cross-linked acrylic rubber product can be used without any particular limitation.
  • examples of the cross-linking site monomer include a cross-linking site monomer having an epoxy group, a cross-linking site monomer having an active chlorine group, and a cross-linking site monomer having a carboxyl group.
  • Examples of the cross-linking site monomer having a carboxyl group include a carboxyl group-containing ⁇ , ⁇ -ethylenically unsaturated monomer.
  • Examples of the carboxyl group-containing ⁇ , ⁇ -ethylenically unsaturated monomer include ⁇ , ⁇ -ethylenically unsaturated monocarboxylic acid, ⁇ , ⁇ -ethylenically unsaturated polyvalent carboxylic acid, ⁇ , ⁇ -ethylenically unsaturated polyvalent carboxylic acid anhydride, and ⁇ , ⁇ -ethylenically unsaturated polyvalent carboxylic acid partial ester.
  • Examples of the ⁇ , ⁇ -ethylenically unsaturated monocarboxylic acid include acrylic acid, methacrylic acid, ethyl acrylic acid, and crotonic acid.
  • Examples of the ⁇ , ⁇ -ethylenically unsaturated polyvalent carboxylic acid include fumaric acid, maleic acid, itaconic acid, and citraconic acid.
  • Examples of the ⁇ , ⁇ -ethylenically unsaturated polyvalent carboxylic acid anhydride include maleic anhydride and itaconic anhydride.
  • Examples of the ⁇ , ⁇ -ethylenically unsaturated polyvalent carboxylic acid partial ester include a butenedionic acid monoester such as monomethyl fumarate, mono-n-butyl fumarate, monoethyl maleate, mono-n-butyl maleate, mono-cyclopentyl fumarate, mono-cyclohexyl fumarate, or mono-cyclohexenyl maleate; and an itaconic acid monoester such as monoethyl itaconate or mono-n-butyl itaconate.
  • a butenedionic acid monoester such as monomethyl fumarate, mono-n-butyl fumarate, monoethyl maleate, mono-n-butyl maleate, mono-cyclopentyl fumarate, mono-cyclohexyl fumarate, or mono-cyclohexenyl maleate
  • an itaconic acid monoester such as monoethyl itaconate or mono-n
  • the cross-linking site monomer having a carboxyl group the ⁇ , ⁇ -ethylenically unsaturated polyvalent carboxylic acid partial ester is preferable, butenedionic acid monoester is more preferable, and mono-n-butyl fumarate is particularly preferable.
  • cross-linking site monomer having an active chlorine group examples include 2-chloroethyl acrylate, 2-chloroethyl vinyl ether, vinyl chloroacetate, allyl chloroacetate, vinylbenzyl chloride, chloromethyl vinyl ketone, and 5-chloromethyl-2-norbornene.
  • vinyl chloroacetate is preferable as the cross-linking site monomer having an active chlorine group.
  • examples of the cross-linking site monomer having an epoxy group include glycidyl acrylate, glycidyl methacrylate, allyl glycidyl ether, and methallyl glycidyl ether.
  • the acrylic rubber of the present invention may contain other monomer units copolymerizable with the above monomers (also referred to as "other monomer unit") as long as an object of the present invention is not essentially impaired.
  • copolymerizable other monomers examples include an aromatic vinyl monomer such as styrene, ⁇ -methyl styrene, vinyl benzyl chloride, and divinylbenzene; an ⁇ , ⁇ -ethylenically unsaturated nitrile monomer such as acrylonitrile and methacrylonitrile; a monomer having two or more (meth)acryloyloxy groups (polyfunctional acryl monomer), such as a (meth)acrylic acid diester of ethylene glycol and a (meth)acrylic acid diester of propylene glycol; 3,4-epoxy-1-butene, 1,2-epoxy-3-pentene, 1,2-epoxy-5,9-cyclododecadiene, 2-hydroxyethyl (meth)acrylic acid, 2-hydroxypropyl (meth)acrylic acid, 3-hydroxypropyl (meth)acrylic acid, (meth)acrylamide, N-hydroxy (meth)acrylamide, ethylene,
  • a content of the other monomer unit in the acrylic rubber of the present invention is preferably 10% by weight or less, more preferably 5% by weight or less, and it is particularly preferable that the acrylic rubber does not contain any other monomer unit.
  • the acrylic rubber of the present invention can be manufactured by polymerizing a monomer mixture containing (A) the methyl methacrylate, (B) the ethyl acrylate, (C) the n-butyl acrylate, (D) the 2-methoxyethyl acrylate, (E) the cross-linking site monomer, and other monomers by using a known method such as emulsion polymerization, suspension polymerization, solution polymerization, or bulk polymerization.
  • a known method such as emulsion polymerization, suspension polymerization, solution polymerization, or bulk polymerization.
  • an emulsion polymerization method under normal pressure can be preferably employed due to easy control of e.g. a polymerization reaction.
  • the total amount of all the kinds of the above monomers are not necessarily required to be supplied to a place of a reaction at the beginning of the reaction, but may be added continuously or intermittently throughout the reaction time considering e.g. a copolymerization reactivity ratio, a reaction conversion ratio, or may be introduced at once or dividedly in the middle of the reaction or in the latter half of the reaction.
  • a charging ratio of each of the above monomers in the polymerization reaction is required to be adjusted depending on a reactivity of each of the monomers.
  • the polymerization reaction proceeds almost quantitatively, and therefore the charging ratio is only required to be matched with a desired monomer unit composition of an acrylic rubber.
  • a Mooney viscosity (ML 1 + 4, 100°C) of the acrylic rubber of the present invention is preferably 10 to 90, more preferably 15 to 80, and particularly preferably 20 to 70.
  • Mooney viscosity is too small, moldability of an acrylic rubber composition may be lowered due to a decrease in a shape retention property thereof, or tensile strength of a cross-linked rubber product may be lowered.
  • the Mooney viscosity is too large, moldability of an acrylic rubber composition may be lowered due to a decrease in fluidity thereof.
  • the acrylic rubber composition of the present invention contains the above-mentioned acrylic rubber and a cross-linking agent.
  • the cross-linking agent is not particularly limited as long as it forms a cross-linking structure by a reaction with (e) the cross-linking site monomer unit acting as a cross-linking site in the acrylic rubber.
  • the cross-linking site monomer (E) for introducing (e) the cross-linking site monomer unit is a cross-linking site monomer having a carboxyl group
  • a cross-linking agent for a carboxyl group can be used.
  • the cross-linking agent for a carboxyl group include a polyvalent amine compound, a polyvalent hydrazide compound, a polyvalent epoxy compound, a polyvalent isocyanate compound, and an aziridine compound.
  • the polyvalent amine compound preferably has 4 to 30 carbon atoms.
  • examples of such a polyvalent amine compound include an aliphatic polyvalent amine compound and an aromatic polyvalent amine compound, but do not include a compound having a nonconjugated nitrogen-carbon double bond, such as a guanidine compound.
  • Examples of the aliphatic polyvalent amine compound include hexamethylene diamine, hexamethylenediamine carbamate, and N,N'-dicinnamylidene-1,6-hexanediamine. These may be used alone, or may be used in combination of two or more kinds thereof.
  • aromatic polyvalent amine compound examples include 4,4'-methylene dianiline, m-phenylenediamine, 4,4'-diaminodiphenyl ether, 3,4'-diaminodiphenyl ether, 4,4'-(m-phenylene diisopropylidene) dianiline, 4,4'-(p-phenylene diisopropylidene) dianiline, 2,2'-bis[4-(4-aminophenoxy) phenyl] propane, 4,4'-diamino benzanilide, 4,4'-bis(4-aminophenoxy) biphenyl, m-xylylenediamine, p-xylylenediamine, and 1,3,5-benzenetriamine. These may be used alone, or may be used in combination of two or more kinds thereof.
  • polyvalent hydrazide compound examples include oxalic acid dihydrazide, malonic acid dihydrazide, succinic acid dihydrazide, glutaric acid dihydrazide, adipic acid dihydrazide, pimelic acid dihydrazide, suberic acid dihydrazide, azelaic acid dihydrazide, sebacic acid dihydrazide, dodecanedioic acid dihydrazide, phthalic acid dihydrazide, isophthalic acid dihydrazide, terephthalic acid dihydrazide, 2,6-naphthalene dicarboxylic acid dihydrazide, naphthalic acid dihydrazide, acetone dicarboxylic acid dihydrazide, fumaric acid dihydrazide, maleic acid dihydrazide, itaconic acid dihydrazide, trimellitic acid dihydrazide, 1,3,5-benzenetricarboxylic acid di
  • the polyvalent epoxy compound examples include a compound having two or more epoxy groups in a molecule thereof, such as a glycidyl ether-type epoxy compound including a phenol novolak-type epoxy compound, a cresol novolak-type epoxy compound, a cresol-type epoxy compound, a bisphenol A-type epoxy compound, a bisphenol F-type epoxy compound, a brominated bisphenol A-type epoxy compound, a brominated bisphenol F-type epoxy compound, and a hydrogenated bisphenol A-type epoxy compound; or another polyvalent epoxy compound including an alicyclic epoxy compound, a glycidyl ester-type epoxy compound, a glycidyl amine-type epoxy compound, and an isocyanurate-type epoxy compound. These may be used alone, or may be used in combination of two or more kinds thereof.
  • a glycidyl ether-type epoxy compound including a phenol novolak-type epoxy compound, a cresol novolak-type epoxy compound, a cresol-
  • diisocyanates and triisocyanates having 6 to 24 carbon atoms are preferable.
  • diisocyanates include 2,4-tolylene diisocyanate (2,4-TDI), 2,6-tolylene diisocyanate (2,6-TDI), 4,4'-diphenylmethane diisocyanate (MDI), hexamethylene diisocyanate, p-phenylene diisocyanate, m-phenylene diisocyanate, and 1,5-naphthylene diisocyanate.
  • triisocyanates include 1,3,6-hexamethylene triisocyanate, 1,6,11-undecane triisocyanate, and bicycloheptane triisocyanate. These can be used alone, or can be used in combination of two or more kinds thereof.
  • aziridine compound examples include tris-2,4,6 (1-aziridinyl)-1,3,5-triazine, tris[1-(2-methyl) aziridinyl] phosphine oxide, and hexa[1-(2-methyl) aziridinyl] triphosphatriazine. These can be used alone, or can be used in combination of two or more kinds thereof.
  • a polyvalent amine compound and a polyvalent hydrazide compound can be preferably used, the polyvalent amine compound can be more preferably used, and an aliphatic diamine and an aromatic diamine can be particularly preferably used.
  • the aliphatic diamines hexamethylenediamine carbamate is preferable.
  • the aromatic diamines 2,2'-bis[4-(4-aminophenoxy)phenyl] propane is preferable.
  • cross-linking site monomer (E) for introducing (e) the cross-linking site monomer unit is a cross-linking site monomer having an active chlorine group
  • a cross-linking agent for an active chlorine group examples include: a triazine thiol derivative such as trithiocyanuric acid and 2,4,6-trimercapto-s-triazine; an organic carboxylic acid ammonium salt such as ammonium benzoate and ammonium adipate; a metal soap and sulfur.
  • a triazine thiol derivative can be preferably used, and 2,4,6-trimercapto-s-triazine can be more preferably used.
  • cross-linking site monomer (E) for introducing (e) the cross-linking site monomer unit is a cross-linking site monomer having an epoxy group
  • a cross-linking agent for an epoxy group can be used.
  • the cross-linking agent for an epoxy group include: ammonium benzoate; a dithiocarbamate; a polyamine and a derivative thereof; imidazoles; polycarboxylic acid and a quaternary ammonium salt, or polycarboxylic acid and a quaternary phosphonium salt.
  • a content of the cross-linking agent in the acrylic rubber composition of the present invention is preferably 0.05 to 20 parts by weight, more preferably 0.1 to 10 parts by weight, and particularly preferably 0.2 to 7 parts by weight with respect to 100 parts by weight of the acrylic rubber.
  • the content of the cross-linking agent is too small, cross-linking is insufficient, and it may be difficult to maintain a shape of a cross-linked acrylic rubber product.
  • the content of the cross-linking agent is too large, a cross-linked acrylic rubber product may be too hard, and elasticity thereof may be impaired.
  • the acrylic rubber composition of the present invention may contain an additive such as a cross-linking accelerator, a processing aid, an anti-aging agent, a light stabilizer, a plasticizer, a reinforcing agent (for example, carbon black, silica, or calcium carbonate), a slip agent, a silane coupling agent, a tackifier, a lubricant, a flame retardant, an antifungal agent, an antistatic agent, a coloring agent, or a filler, if necessary.
  • an additive such as a cross-linking accelerator, a processing aid, an anti-aging agent, a light stabilizer, a plasticizer, a reinforcing agent (for example, carbon black, silica, or calcium carbonate), a slip agent, a silane coupling agent, a tackifier, a lubricant, a flame retardant, an antifungal agent, an antistatic agent, a coloring agent, or a filler, if necessary.
  • a cross-linking accelerator for
  • the acrylic rubber composition of the present invention preferably further contains a cross-linking accelerator.
  • the cross-linking accelerator is not particularly limited.
  • the cross-linking site monomer (E) for introducing (e) the cross-linking site monomer unit is a cross-linking site monomer having a carboxyl group and the cross-linking agent is a polyvalent amine compound
  • preferable examples of the cross-linking accelerator include an aliphatic monovalent secondary amine compound, an aliphatic monovalent tertiary amine compound, a guanidine compound, an imidazole compound, a quaternary onium salt, a tertiary phosphine compound, an alkali metal salt of a weak acid, and a diazabicycloalkene compound.
  • These cross-linking accelerators can be used alone, or can be used in combination of two or more kinds thereof.
  • the aliphatic monovalent secondary amine compound is obtained by replacing two hydrogen atoms of ammonia with aliphatic hydrocarbon groups.
  • the aliphatic hydrocarbon group to be replaced with the hydrogen atom preferably has 1 to 30 carbon atoms, and more preferably has 8 to 20 carbon atoms.
  • aliphatic monovalent secondary amine compound examples include dimethylamine, diethylamine, di-n-propylamine, diallylamine, diisopropylamine, di-n-butylamine, di-t-butylamine, di-sec-butylamine, dihexylamine, diheptylamine, dioctylamine, dinonylamine, didecylamine, diundecylamine, didodecylamine, ditridecylamine, ditetradecylamine, dipentadecylamine, dicetylamine, di-2-ethylhexylamine, dioctadecylamine, di-cis-9-octadecenylamine, and dinonadecylamine.
  • dioctylamine dioctylamine, didecylamine, didodecylamine, ditetradecylamine, dicetylamine, dioctadecylamine, di-cis-9-octadecenylamine, and dinonadecylamine are preferable.
  • the aliphatic monovalent tertiary amine compound is obtained by replacing all the three hydrogen atoms of ammonia with aliphatic hydrocarbon groups.
  • the aliphatic hydrocarbon group to be replaced with the hydrogen atom preferably has 1 to 30 carbon atoms, and more preferably has 1 to 22 carbon atoms.
  • aliphatic monovalent tertiary amine compound examples include trimethylamine, triethylamine, tri-n-propylamine, triallylamine, triisopropylamine, tri-n-butylamine, tri-t-butylamine, tri-sec-butylamine, trihexylamine, triheptylamine, trioctylamine, trinonylamine, tridecylamine, triundecylamine, tridodecylamine, tritridecylamine, tritetradecylamine, tripentadecylamine, tricetylamine, tri-2-ethylhexylamine, trioctadecylamine, tri-cis-9-octadecenylamine, trinonadecylamine, N,N-dimethyldecylamine, N,N-dimethyldodecylamine, N,N-dimethyltetradecy
  • N,N-dimethyldodecylamine, N,N-dimethyltetradecylamine, N,N-dimethylcetylamine, N,N-dimethyloctadecylamine, and N,N-dimethylbehenylamine are preferable.
  • guanidine compound examples include 1,3-di-o-tolyl guanidine and 1,3-diphenyl guanidine. 1,3-di-o-tolyl guanidine is preferable.
  • imidazole compound examples include 2-methyl imidazole and 2-phenyl imidazole.
  • quaternary onium salt examples include tetra-n-butylammonium bromide and octadecyl tri-n-butylammonium bromide.
  • tertiary phosphine compound examples include triphenylphosphine and tri-p-tolyl phosphine.
  • alkali metal salt of a weak acid examples include an inorganic weak acid salt such as sodium phosphate, potassium phosphate, sodium carbonate, or potassium carbonate, and an organic weak acid salt such as sodium stearate, potassium stearate, sodium laurate, or potassium laurate.
  • diazabicycloalkene compound examples include 1,8-diazabicyclo [5.4.0] undec-7-ene (DBU) and 1,5-diazabicyclo [4.3.0] non-5-ene (DBN).
  • DBU 1,8-diazabicyclo [5.4.0] undec-7-ene
  • DBN 1,5-diazabicyclo [4.3.0] non-5-ene
  • cross-linking site monomer (E) for introducing (e) the cross-linking site monomer unit is a cross-linking site monomer having an active chlorine group and the cross-linking agent is sulfur
  • the cross-linking accelerator include fatty acid metal soap.
  • the cross-linking site monomer (E) for introducing (e) the cross-linking site monomer unit is a cross-linking site monomer having an active chlorine group and the cross-linking agent is a triazine thiol derivative
  • the cross-linking accelerator include a dithiocarbamate and a derivative thereof, a thiourea compound, and a thiuram sulfide compound. These cross-linking accelerators can be used alone, or can be used in combination of two or more kinds thereof.
  • fatty acid metal soap examples include sodium stearate, potassium stearate, potassium oleate, sodium laurate, and sodium 2-ethylhexanoate.
  • dithiocarbamate and a derivative thereof include a dithiocarbamic acid metal salt such as zinc dimethyldithiocarbamate, zinc diethyldithiocarbamate, zinc dibutyldithiocarbamate, zinc methylbenzyl dithiocarbamate, zinc dibenzyl dithiocarbamate, zinc methylcyclohexyl dithiocarbamate, zinc N-pentamethylene dithiocarbamate, copper dimethyldithiocarbamate, lead dimethyldithiocarbamate, cadmium dimethyldithiocarbamate, bismuth dimethyldithiocarbamate, ferric dimethyldithiocarbamate, tellurium dimethyldithiocarbamate, or selenium dimethyldithiocarbamate; and a complex salt of a dithiocarbamic acid metal salt and an amine such as dibutylamine or cyclohexylethylamine, and a double salt
  • thiourea compound examples include diphenyl thiourea, diethyl thiourea, dibutyl thiourea, di-o-tolyl thiourea, trimethyl thiourea, and ethylene thiourea. Among them, diethyl thiourea is preferable.
  • thiuram sulfide compound examples include tetramethylthiuram monosulfide, tetramethylthiuram disulfide, tetraethylthiuram disulfide, tetra-n-butylthiuram disulfide, and di-pentamethylenethiuram tetrasulfide.
  • the cross-linking site monomer (E) for introducing (e) the cross-linking site monomer unit is a cross-linking site monomer having an epoxy group and the cross-linking agent is a dithiocarbamate
  • preferable examples of the cross-linking accelerator include a dithiocarbamate other than the dithiocarbamate used as the cross-linking agent.
  • zinc dithiocarbamate is used as the cross-linking agent
  • ferric dithiocarbamate is preferable as the cross-linking accelerator.
  • a use amount of the cross-linking accelerator is preferably 0.1 to 20 parts by weight, more preferably 0.2 to 15 parts by weight, and particularly preferably 0.3 to 10 parts by weight with respect to 100 parts by weight of the acrylic rubber.
  • the amount of the cross-linking accelerator is too large, a cross-linking speed may be too high during cross-linking, a bloom of the cross-linking accelerator may be generated on a surface of a cross-linked product, or the cross-linked product may be too hard.
  • the amount of the cross-linking accelerator is too small, tensile strength of a cross-linked product may be lowered significantly.
  • a polymer such as a rubber other than the acrylic rubber of the present invention, an elastomer, or a resin may be added to the acrylic rubber composition of the present invention, if necessary.
  • the elastomer examples include an olefin-based elastomer, a styrene-based elastomer, a polyester-based elastomer, a polyamide-based elastomer, a polyurethane-based elastomer, and a polysiloxane-based elastomer.
  • the resin examples include an olefin-based resin, a styrene-based resin, an acrylic-based resin, polyphenylene ether, polyester, polycarbonate, and polyamide.
  • a mixing method such as roll mixing, Banbury mixing, screw mixing, and solution mixing can be employed appropriately.
  • a blending order is not particularly limited. However, it may be required to mix components sufficiently which are resistant to reaction or decomposition by heat and then to mix components which easily react or decomposite by heat (for example, a cross-linking agent or a cross-linking accelerator) at a temperature at which the reaction or decomposition will not occur in a short time.
  • the cross-linked acrylic rubber product of the present invention is obtained by cross-linking the above-mentioned acrylic rubber composition.
  • Cross-linking is usually performed by heating the acrylic rubber composition.
  • a cross-linking temperature is preferably 130 to 220°C, and more preferably 140°C to 200°C
  • cross-linking time is preferably 30 seconds to two hours, and more preferably one minute to one hour. This cross-linking at a first step is also referred to as primary cross-linking.
  • Examples of a molding method for obtaining a cross-linked acrylic rubber product having a desired shape include a conventionally known molding method such as extrusion molding, injection molding, transfer molding, and compression molding. Of course, cross-linking can be performed by heating at the same time as molding.
  • a cross-linked acrylic rubber product molded into a desired shape can be used as the seal member of the present invention.
  • a long-length extrusion molded product having a desired cross sectional shape e.g. a plate, a rod, a pipe, a hose, or a deformed article
  • a rubber composition prepared e.g. by roll mixing to a feed port of an extruder softening the rubber composition by heating from a barrel in a process of sending the rubber composition to a head portion with a screw, and causing the rubber composition to pass through a die having a predetermined shape and disposed in the head portion.
  • shaping can be performed by filling a cavity of a mold having a shape of one product or several products with the acrylic rubber composition of the present invention. By heating this mold, shaping and cross-linking can be performed almost simultaneously.
  • secondary cross-linking can be performed, if necessary, by heating this cross-linked acrylic rubber product e.g. in an oven using e.g. electricity, hot air, steam, as a heat source at 130°C to 220°C, preferably at 140°C to 200°C for 1 to 48 hours.
  • the cross-linked acrylic rubber product of the present invention has a basic characteristic as an acrylic rubber, such as tensile strength, elongation, or hardness.
  • the cross-linked acrylic rubber product has an excellent balance between oil resistance and cold resistance, and further has excellent hydrolysis resistance. Therefore, for example, the cross-linked acrylic rubber product of the present invention can be used suitably for a seal member in contact with an oil for an engine.
  • the seal member of the present invention is used in an environment in contact with a predetermined mixed liquid.
  • the seal member is used in an environment in contact with an oil for an engine containing water and zinc.
  • a metal salt such as zinc derived from various additives contained in the oil for an engine and influence of heat.
  • a content of water contained in the oil for an engine in contact with the seal member is 500 to 2000 ppm
  • a content of zinc contained in the oil for an engine in contact with the seal member is 1000 to 5000 ppm.
  • the seal member of the present invention has an excellent balance between oil resistance and cold resistance, and further has excellent hydrolysis resistance by using a specific cross-linked acrylic rubber product specified in the seal member of the present invention. Even when the contents of water and zinc contained in the oil for an engine in contact with the seal member are outside the above ranges, the seal member of the present invention has an excellent balance between oil resistance and cold resistance, and further has excellent hydrolysis resistance.
  • the seal member of the present invention has an excellent balance between oil resistance and cold resistance, and further has excellent hydrolysis resistance only by using a specific cross-linked acrylic rubber product specified in the seal member of the present invention.
  • the seal member of the present invention has a basic characteristic as an acrylic rubber, such as tensile strength, elongation, or hardness.
  • the seal member has an excellent balance between oil resistance and cold resistance, and further has excellent hydrolysis resistance. Therefore, the seal member of the present invention can be used suitably for a seal member used in an environment in contact with an oil for an engine (particularly an oil for an engine containing water, or zinc derived from various additives).
  • the seal member can be used suitably for a head cover gasket, a plug tube gasket, a cam journal orifice gasket, a spool valve gasket, an oil pressure sensor gasket, a cam shaft thrust gasket, a valve timing control valve gasket, a valve timing control filter gasket, a cylinder head plug gasket, an oil filter cartridge gasket, an oil filter base gasket, a baffle plate gasket, a gallery cap bolt gasket, a lower block orifice gasket, a positive crankcase ventilation valve gasket, an oil path orifice gasket, an oil level pipe gasket, an oil pump gasket, a chain case gasket, an oil filter gasket, an oil cooler gasket, and an oil pan gasket.
  • a Mooney viscosity of an acrylic rubber was measured at a measurement temperature of 100°C in accordance with a Mooney viscosity test of uncross-linked rubber physical testing methods prescribed in JIS K6300.
  • Each of acrylic rubber compositions obtained in Examples and Comparative Example was put in a mold having a vertical length of 15 cm, a horizontal length of 15 cm, and a depth of 0.2 cm, and was pressed at 170°C for 20 minutes while being pressurized at a press pressure of 10 MPa to obtain a sheet-like cross-linked acrylic rubber product. Subsequently, the resulting sheet-like cross-linked acrylic rubber product was put in a gear oven, and was heated at 170°C for four hours. The resulting sheet-like cross-linked acrylic rubber product was punched by a dumbbell-shaped No. 3 to manufacture a test piece. Subsequently, using this test piece, tensile strength and elongation were measured in accordance with JIS K6251, and hardness was measured in accordance with JIS K6253 using a durometer hardness tester (type A).
  • the hydrolysis resistance test was performed in conformity to JIS K6258.
  • a test piece As for a test piece, a sheet-like cross-linked acrylic rubber product was obtained in a similar manner to evaluation of the above-described normal physical properties, and the resulting sheet-like cross-linked acrylic rubber product was punched to manufacture a test piece for a volume change test and a test piece for a tensile test.
  • a test piece for a volume change test a test piece having a vertical length of 30 mm, a horizontal length of 20 mm, and a thickness of 2.0 ⁇ 0.2 mm was manufactured.
  • a dumbbell-shaped No. 3 test piece prescribed in JIS K6251 was manufactured.
  • the test piece for a volume change test and the test piece for a tensile test were put in a glass tube having an inner volume of 250 cc in a form of being hung on a PTFE hanger. 200 cc of a test liquid was put therein, and the test pieces were disposed such that all parts of each of the test pieces were immersed in the liquid. Subsequently, the glass tube was put in a metal pressure-resistant container. The metal pressure-resistant container was completely sealed with a metal lid provided with a PTFE packing such that a liquid did not leak from an inside thereof. In addition, the metal pressure-resistant container was put in an oven, and was heated at 120°C for 480 hours.
  • test liquid a liquid obtained by dissolving zinc chloride (manufactured by Sigma-Aldrich, purity: 97% or more) in distilled water and adjusting a concentration thereof to 1 wt% was used.
  • the metal pressure-resistant container was taken out from the oven, and was left to cool until a temperature thereof became 100°C or lower. Subsequently, the lid was removed, and the glass tube was taken out from the inside. The test pieces in the glass tube were taken out, were put in a gear oven, and were heated and dried at 120°C for 70 hours.
  • a volume of the test piece for a volume change test obtained in this way was measured, and a volume change ratio ⁇ V (%) with respect to an initial volume was calculated.
  • tensile strength and elongation were measured in accordance with JIS K6251, and hardness was measured in accordance with JIS K6253 using a durometer hardness tester (type A).
  • elongation crack generation of a small crack (hereinafter, referred to as an elongation crack) on an edge of the test piece was observed. Note that, in Table 1, a case where no elongation crack was generated was indicated by "Good”, and a case where an elongation crack was generated was indicated by "Poor".
  • a test piece having a volume change ratio closer to zero, larger values of tensile strength and elongation, and smaller hardness change has better hydrolysis resistance. Further, a test piece in which no elongation crack is observed has better hydrolysis resistance.
  • a sheet-like cross-linked acrylic rubber product was obtained in a similar manner to evaluation of the above-described normal physical properties, and the resulting sheet-like cross-linked acrylic rubber product was punched to manufacture a test piece. Specifically, a test piece having a vertical length of 30 mm, a horizontal length of 20 mm, and a thickness of 2.0 ⁇ 0.2 mm was manufactured for a volume change test.
  • test piece for a volume change test was put in a glass tube having an inner volume of 250 cc, 200 cc of a test liquid was put therein, and the test piece was disposed such that all parts of the test piece were immersed in the liquid.
  • a glass tube was put in a heating tank, and was heated at 150°C for 72 hours.
  • test liquid a test lubricating oil No. 3 oil described in JIS K6258 (trade name: IRM 903, manufactured by Japan Sun Oil Company, Ltd.) was used.
  • test piece for a volume change test was taken out, and the test liquid was wiped off. Thereafter, a volume of thereof was measured, and a volume change ratio ⁇ V (%) with respect to an initial volume was calculated.
  • a test piece having a smaller volume change ratio has better oil resistance.
  • a sheet-like cross-linked acrylic rubber product was obtained in a similar manner to evaluation of the above-described normal physical properties, and the resulting sheet-like cross-linked acrylic rubber product was punched to manufacture a test piece having a length of 40.0 ⁇ 2.5 mm, a width of 3.0 ⁇ 0.2 mm, and a thickness of 2.0 ⁇ 0.2 mm.
  • a test was performed using a Gehman stiffness tester (manufactured by Toyo Seiki Seisaku-sho, Ltd.). A temperature at which a specific modulus was 10 (hereinafter referred to as Chaman t10) was determined. A test piece having a lower value of Whyman t10 has better cold resistance.
  • Emulsion polymerization was started under normal pressure at a temperature of 30°C to cause a reaction until a polymerization conversion ratio reached 95%.
  • the resulting emulsion polymerization liquid was coagulated with a calcium chloride solution, was washed with water, and was dried to obtain acrylic rubber (A1).
  • the acrylic rubber (A1) had a composition of 10% by weight of methyl methacrylate units, 4.5% by weight of ethyl acrylate units, 65% by weight of n-butyl acrylate units, 19% by weight of 2-methoxyethyl acrylate units, and 1.5% by weight of mono-n-butyl maleate units.
  • a Mooney viscosity (ML 1 + 4, 100°C) of the acrylic rubber (A1) was 35.
  • Emulsion polymerization was started under normal pressure at a temperature of 30°C to cause a reaction until a polymerization conversion ratio reached 95%.
  • the resulting emulsion polymerization liquid was coagulated with a calcium chloride solution, was washed with water, and was dried to obtain acrylic rubber (A2).
  • the acrylic rubber (A2) had a composition of 15% by weight of methyl methacrylate units, 4.5% by weight of ethyl acrylate units, 65% by weight of n-butyl acrylate units, 14% by weight of 2-methoxyethyl acrylate units, and 1.5% by weight of mono-n-butyl maleate units.
  • a Mooney viscosity (ML 1 + 4, 100°C) of the acrylic rubber (A2) was 40.
  • Emulsion polymerization was started under normal pressure at a temperature of 30°C to cause a reaction until a polymerization conversion ratio reached 95%.
  • the resulting emulsion polymerization liquid was coagulated with a calcium chloride solution, was washed with water, and was dried to obtain acrylic rubber (A3).
  • the acrylic rubber (A3) had a composition of 18% by weight of methyl methacrylate units, 4.5% by weight of ethyl acrylate units, 65% by weight of n-butyl acrylate units, 11% by weight of 2-methoxyethyl acrylate units, and 1.5% by weight of mono-n-butyl maleate units.
  • a Mooney viscosity (ML 1 + 4, 100°C) of the acrylic rubber (A3) was 40.
  • Emulsion polymerization was started under normal pressure at a temperature of 30°C to cause a reaction until a polymerization conversion ratio reached 95%.
  • the resulting emulsion polymerization liquid was coagulated with a calcium chloride solution, was washed with water, and was dried to obtain acrylic rubber (A4).
  • the acrylic rubber (A4) had a composition of 10% by weight of methyl methacrylate units, 4.5% by weight of ethyl acrylate units, 60% by weight of n-butyl acrylate units, 24% by weight of 2-methoxyethyl acrylate units, and 1.5% by weight of mono-n-butyl maleate units.
  • a Mooney viscosity (ML 1 + 4, 100°C) of the acrylic rubber (A4) was 35.
  • Emulsion polymerization was started under normal pressure at a temperature of 30°C to cause a reaction until a polymerization conversion ratio reached 95%.
  • the resulting emulsion polymerization liquid was coagulated with a calcium chloride solution, was washed with water, and was dried to obtain acrylic rubber (A5).
  • the acrylic rubber (A5) had a composition of 15% by weight of methyl methacrylate units, 4.5% by weight of ethyl acrylate units, 65% by weight of n-butyl acrylate units, 14% by weight of 2-methoxyethyl acrylate units, and 1.5% by weight of vinyl chloroacetate units.
  • a Mooney viscosity (ML 1 + 4, 100°C) of the acrylic rubber (A5) was 40.
  • the resulting emulsion polymerization liquid was coagulated with a calcium chloride solution, was washed with water, and was dried to obtain acrylic rubber (A6).
  • the acrylic rubber (A6) had a composition of 10% by weight of methyl methacrylate units, 23.5% by weight of ethyl acrylate units, 65% by weight of n-butyl acrylate units, and 1.5% by weight of mono-n-butyl maleate units.
  • a Mooney viscosity (ML 1 + 4, 100°C) of the acrylic rubber (A6) was 40.
  • Emulsion polymerization was started under normal pressure at a temperature of 30°C to cause a reaction until a polymerization conversion ratio reached 95%.
  • the resulting emulsion polymerization liquid was coagulated with a calcium chloride solution, was washed with water, and was dried to obtain acrylic rubber (A7).
  • the acrylic rubber (A7) had a composition of 5% by weight of methyl methacrylate units, 4.5% by weight of ethyl acrylate units, 65% by weight of n-butyl acrylate units, 24% by weight of 2-methoxyethyl acrylate units, and 1.5% by weight of mono-n-butyl maleate units.
  • a Mooney viscosity (ML 1 + 4, 100°C) of the acrylic rubber (A7) was 35.
  • HAF carbon black (trade name "SEAST 3", manufactured by Tokai Carbon Co., filler), 1 part of stearic acid, 1 part of an ester-based wax (trade name “Greg G-8205", manufactured by Dainippon Ink and chemicals, Inc., slip agent), and 4,4'-di-( ⁇ , ⁇ -dimethylbenzyl)diphenylamine (trade name: Nocrac CD, manufactured by Ouchi Shinko chemical industry Co., Ltd., anti-aging agent) were added to 100 parts of the acrylic rubber (Al), and were mixed using a Banbury mixer at 50°C for five minutes. Subsequently, the resulting mixture was transferred to a roll at 50°C.
  • a test piece was obtained using the resulting acrylic rubber composition by the above method, and normal physical properties (tensile strength, elongation, and hardness), hydrolysis resistance, oil resistance, and cold resistance were evaluated. The results are shown in Table 1.
  • An acrylic rubber composition was obtained by a similar method to Example 1 except for using the acrylic rubber (A2) in place of the acrylic rubber (A1).
  • a test piece was obtained using the resulting acrylic rubber composition by the above method, and normal physical properties (tensile strength, elongation, and hardness), hydrolysis resistance, oil resistance, and cold resistance were evaluated. The results are shown in Table 1.
  • An acrylic rubber composition was obtained by a similar method to Example 1 except for using the acrylic rubber (A3) in place of the acrylic rubber (A1).
  • a test piece was obtained using the resulting acrylic rubber composition by the above method, and normal physical properties (tensile strength, elongation, and hardness), hydrolysis resistance, oil resistance, and cold resistance were evaluated. The results are shown in Table 1.
  • An acrylic rubber composition was obtained by a similar method to Example 1 except for using the acrylic rubber (A4) in place of the acrylic rubber (A1).
  • a test piece was obtained using the resulting acrylic rubber composition by the above method, and normal physical properties (tensile strength, elongation, and hardness), hydrolysis resistance, oil resistance, and cold resistance were evaluated. The results are shown in Table 1.
  • An acrylic rubber composition was obtained by a similar method to Example 1 except for using the acrylic rubber (A5) in place of the acrylic rubber (A1), and using 0.5 parts of 2,4,6-trimercapto-s-triazine (trade name: ZISNET-F, manufactured by Sanyo chemical Industries, Ltd., cross-linking agent), 1.5 parts of zinc dibutyldithiocarbamate (trade name: Nocceler BZ, manufactured by Ouchi Shinko chemical industrial Co., Ltd., cross-linking accelerator), 0.3 parts of diethyl thiourea (trade name: Nocceler EUR, manufactured by Ouchi Shinko chemical industrial Co., Ltd., cross-linking accelerator), and 0.2 parts of N-(cyclohexylthio) phthalimide (trade name: retarder CTP, manufactured by Ouchi Shinko chemical industrial Co., scorch preventer) in place of 0.5 parts of hexamethylenediamine carbamate (trade name: Diak #1, manufactured by Dupont Elastomer
  • a test piece was obtained using the resulting acrylic rubber composition by the above method, and normal physical properties (tensile strength, elongation, and hardness), hydrolysis resistance, oil resistance, and cold resistance were evaluated. The results are shown in Table 1.
  • An acrylic rubber composition was obtained by a similar method to Example 1 except for using the acrylic rubber (A6) in place of the acrylic rubber (A1).
  • a test piece was obtained using the resulting acrylic rubber composition by the above method, and normal physical properties (tensile strength, elongation, and hardness), hydrolysis resistance, oil resistance, and cold resistance were evaluated. The results are shown in Table 1.
  • An acrylic rubber composition was obtained by a similar method to Example 1 except for using the acrylic rubber (A7) in place of the acrylic rubber (A1).
  • a test piece was obtained using the resulting acrylic rubber composition by the above method, and normal physical properties (tensile strength, elongation, and hardness), hydrolysis resistance, oil resistance, and cold resistance were evaluated. The results are shown in Table 1.
  • a cross-linked acrylic rubber product obtained by using an acrylic rubber containing 10% of methyl methacrylate units, 65% of n-butyl acrylate units, and no 2-methoxyethyl acrylate unit has excellent hydrolysis resistance, but has poor oil resistance (Comparative Example 1). Further, a cross-linked acrylic rubber product obtained by using an acrylic rubber containing 5% of methyl methacrylate units has an excellent balance between oil resistance and cold resistance, but has poor hydrolysis resistance (Comparative Example 2).

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Sealing Material Composition (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
  • Gasket Seals (AREA)

Claims (9)

  1. Acrylkautschuk, umfassend (a) Methylmethacrylateinheiten, (b) Ethylacrylateinheiten, (c) n-Butylacrylateinheiten, (d) 2-Methoxyethylacrylateinheiten und (e) Vernetzungsstellen-Monomereinheiten, wobei
    der Acrylkautschuk Folgendes enthält:
    10 bis 20% nach Gewicht (a) der Methylmethacrylateinheiten,
    15% oder weniger nach Gewicht (b) der Ethylacrylateinheiten,
    60 bis 80% nach Gewicht (c) der n-Butylacrylateinheiten,
    10 bis 30% nach Gewicht (d) der 2-Methoxyethylacrylateinheiten und
    0,5 bis 5% nach Gewicht (e) der Vernetzungsstellen-Monomereinheiten.
  2. Acrylkautschuk gemäß Anspruch 1, wobei das Vernetzungsstellen-Monomer wenigstens eines aus einer Carboxylgruppe, einer Aktives-Chlor-Gruppe und einer Epoxygruppe aufweist.
  3. Acrylkautschukzusammensetzung, umfassend den Acrylkautschuk gemäß Anspruch 1 oder 2 und ein Vernetzungsmittel.
  4. Acrylkautschukzusammensetzung gemäß Anspruch 3, wobei das Vernetzungsmittel eine mehrwertige Aminverbindung oder ein Triazinthiolderivat ist.
  5. Vernetztes Acrylkautschukprodukt, erhalten durch Vernetzen der Acrylkautschukzusammensetzung gemäß Anspruch 3 oder 4.
  6. Verwendung eines vernetzten Acrylkautschukprodukts für ein Dichtungselement, wobei das vernetzte Acrylkautschukprodukt erhalten wird durch Vernetzen einer Acrylkautschukzusammensetzung, wobei
    die Acrylkautschukzusammensetzung Folgendes enthält:
    einen Acrylkautschuk, enthaltend (a) Methylmethacrylateinheiten, (b) Ethylacrylateinheiten, (c) n-Butylacrylateinheiten, (d) 2-Methoxyethylacrylateinheiten und (e) Vernetzungsstellen-Monomereinheiten, wobei
    der Acrylkautschuk Folgendes enthält:
    10 bis 18% nach Gewicht (a) der Methylmethacrylateinheiten,
    5% oder weniger nach Gewicht (b) der Ethylacrylateinheiten,
    60 bis 65% nach Gewicht (c) der n-Butylacrylateinheiten,
    11 bis 24% nach Gewicht (d) der 2-Methoxyethylacrylateinheiten und
    1 bis 3% nach Gewicht (e) der Vernetzungsstellen-Monomereinheiten, und
    ein Vernetzungsmittel, wobei das Dichtungselement in einer Umgebung verwendet wird, die in Kontakt mit einem Öl für einen Motor steht, enthaltend 500 bis 2000 ppm Wasser und 1000 bis 5000 ppm Zink.
  7. Verwendung des vernetzten Acrylkautschukprodukts für das Dichtungselement gemäß Anspruch 6, wobei das Dichtungselement eines ist aus einer Kopfabdeckungsdichtung, einer Stopfenrohrdichtung, einer Noppenwellenöffnungsdichtung, einer Kolbenventildichtung, einer Öldrucksensordichtung, einer Noppenwellenaxialdichtung, einer Ventil-Zeitsteuerventildichtung, einer Ventil-Zeitsteuerfilterdichtung, einer Zylinderkopfstopfendichtung, einer Ölfilterkassettendichtung, einer Ölfilterbasisdichtung, einer Fangblechdichtung, einer Gallerieschraubendichtung, einer Unterblocköffnungsdichtung, einer Positiv-Kurbelgehäuselüftungsventildichtung, einer Ölleitungsöffnungsdichtung, einer Ölniveauleitungsdichtung, einer Ölpumpendichtung, einer Kettengehäusedichtung, einer Ölfilterdichtung, einer Ölkühlerdichtung und einer Ölwannendichtung.
  8. Verwendung des vernetzten Acrylkautschukprodukts für das Dichtungselement gemäß Anspruch 6 oder 7, wobei das Vernetzungsstellen-Monomer wenigstens eine aus einer Carboxylgruppe, einer Aktives-Chlor-Gruppe und einer Epoxygruppe aufweist.
  9. Verwendung des vernetzten Acrylkautschukprodukts für das Dichtungselement gemäß einem der Ansprüche 6 bis 8, wobei das Vernetzungsmittel eine mehrwertige Aminverbindung oder ein Triazinthiolderivat ist.
EP15814869.2A 2014-07-04 2015-07-03 Acrylkautschuk, acrylkautschukzusammensetzung, vernetztes acrylkautschukprodukt und verwendung von vernetztem akrylkautschukprodukt für dichtungselement Active EP3165544B1 (de)

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CN106471019A (zh) 2017-03-01
US9840572B2 (en) 2017-12-12
JP6582634B2 (ja) 2019-10-02
US20170121439A1 (en) 2017-05-04
JP6628721B2 (ja) 2020-01-15
CN106471019B (zh) 2019-02-05
JP2016027155A (ja) 2016-02-18
KR20170028315A (ko) 2017-03-13
EP3165544A1 (de) 2017-05-10
JPWO2016002936A1 (ja) 2017-04-27
WO2016002936A1 (ja) 2016-01-07

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